Max-fossils Posted November 14, 2017 Share Posted November 14, 2017 Hi all, So, here are a bunch of fossil bittersweet clams (Glycymeris) from different locations. So far they are all labeled as "Glycymeris" (which I'm pretty sure is correct). But I would really like to put a species name on each of them. Therefore I am reaching out to you all, because hopefully you will be able to help me sort this out! 1) Glycymeris from Westerschelde, Netherlands; from the late Pliocene (2.5 million years old). I'm thinking G. radiolyrata, but I'm not sure... 2) Glycymeris from Westerschelde, Netherlands; from the late Pliocene (2.5 million years old). G. obovata maybe? Or G. variabilis??? Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Max-fossils Posted November 14, 2017 Author Share Posted November 14, 2017 3) A small one from Oosterzele, Belgium. From the Lede Sand formation, Lutetian, early Eocene (45 mya). Got no clue for this one... Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Max-fossils Posted November 14, 2017 Author Share Posted November 14, 2017 4) A bittersweet clam from Kaloot, Zeeland, Netherlands. From the Miocene-Pliocene. Not sure about this one either... 5) And finally, one from the Antwerp area, Belgium. From the Miocene-Pliocene. Could it be G. obovata??? Please help me with this intricate puzzle! Best regards, Max Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Spinosaurus Posted November 14, 2017 Share Posted November 14, 2017 these are a few nice ones Link to comment Share on other sites More sharing options...
Max-fossils Posted November 14, 2017 Author Share Posted November 14, 2017 34 minutes ago, Spinosaurus said: these are a few nice ones Thanks The first two were given to me when I joined the WTKG. The second one I got in an old collection. The last two are my personal finds. Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
abyssunder Posted November 15, 2017 Share Posted November 15, 2017 According to Moerdijk, Peter W., & Freddy A.D. van Nieulande. 1995. Glycymeris (Glycymeris) radiolyrata sp. nov. (Mollusca, Bivalvia, Glycymerididae) from the Pliocene of the North Sea Basin. — Contr. Tert. Quatern. Geol., 32(1-3): 3-17, the distinguishing characters of G. variabilis and G. radiolyrata are as follows: G. variabilis invariably shows distinct grooves on the ligamental area, the external ornament consists of a very fine reticulate sculpture, tending .to efface rapidly, and the shell is generally markedly inequilateral, being drawn out posteriorly. In juvenile specimens the umbo is quite prominent. G. radiolyrata has a principally smooth ligamental area and a distinctive external ornament consisting of welldeveloped radial elements especially near the umbones; towards the shell margin the reticulate ornament is less fine and more irregular. The shell is almost equilateral and circular in outline. The umbo of juvenile specimens is not prominent; their external ornament consists of coarse radial elements (Fig. 1) overprinted by concentric grooves. The ornament in juvenile G. variabilis is decidedly finer. here is your older topic: Also, here is a more recent document which may help you: Moerdijk, Peter W. & Freddy. A.D. van Nieulande. 2000. Revision of Pliocene Glycymerididae (Mollusca, Bivalvia) from the North Sea Basin. - Contr. Tert. Quatern. Geol., 3(1-2): 3-21 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Shamalama Posted November 15, 2017 Share Posted November 15, 2017 I recall finding something like those in the Miocene sediments of Calvert Cliffs, MD. -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Max-fossils Posted November 15, 2017 Author Share Posted November 15, 2017 1 hour ago, Shamalama said: I recall finding something like those in the Miocene sediments of Calvert Cliffs, MD. Doesn't surprise me The bittersweet clams are a very widespread family! 1 hour ago, abyssunder said: According to Moerdijk, Peter W., & Freddy A.D. van Nieulande. 1995. Glycymeris (Glycymeris) radiolyrata sp. nov. (Mollusca, Bivalvia, Glycymerididae) from the Pliocene of the North Sea Basin. — Contr. Tert. Quatern. Geol., 32(1-3): 3-17, the distinguishing characters of G. variabilis and G. radiolyrata are as follows: G. variabilis invariably shows distinct grooves on the ligamental area, the external ornament consists of a very fine reticulate sculpture, tending .to efface rapidly, and the shell is generally markedly inequilateral, being drawn out posteriorly. In juvenile specimens the umbo is quite prominent. G. radiolyrata has a principally smooth ligamental area and a distinctive external ornament consisting of welldeveloped radial elements especially near the umbones; towards the shell margin the reticulate ornament is less fine and more irregular. The shell is almost equilateral and circular in outline. The umbo of juvenile specimens is not prominent; their external ornament consists of coarse radial elements (Fig. 1) overprinted by concentric grooves. The ornament in juvenile G. variabilis is decidedly finer. here is your older topic: Also, here is a more recent document which may help you: Moerdijk, Peter W. & Freddy. A.D. van Nieulande. 2000. Revision of Pliocene Glycymerididae (Mollusca, Bivalvia) from the North Sea Basin. - Contr. Tert. Quatern. Geol., 3(1-2): 3-21 Thanks a lot! Ah, yup, I have a lot of different Glycymeris I forgot about this topic... re-reading it was quite helpful. For the other people, here are the two pictures @abyssunder posted on the older topic: PLATE 2Glycymeris (Glycymeris) radiolyrata sp. nov.Fig. 1. Right valve, paratype (RGM 393 824, leg. M. Vervoenen), Lillo Formation, Oorderen Member, Pliocene (Scaldisian), construction pit Beveren tunnel at Kallo (Belgium), x c. 1.25; c - hinge; d - detail of external ornament.Fig. 2. Juvenile left valve (RGD Coll. Mol.673), Pliocene, borehole Nijmegen (’Midden-Plioceen’), x c. 10. PLATE 4Fig. 1. Glycymeris (Glycymeris) variabilis (J. de C. Sowerby, 1824), right valve (RGM 393 826, leg. M. Vervoenen), Lillo Formation, Oorderen Member (level with Angulus benedeni), Pliocene (Scaldisian), construction pit Beveren tunnel at Kallo (Belgium), x 1.7; c - detail of external ornament; d - hinge. Looking at the paper that you just gave, I think that these are the IDs for mine: 1) Glycymeris (Chevronia) variabilis 2) Glycymeris (Glycymeris) radiolyrata exaggerata 3) Glycymeris (G.) radiolyrata pseudodeshayesi 4) Glycymeris (Chevronia) turonica 5) Glycymeris (Glycymeris) radiolyrata exaggerata Do you agree? Thanks again! Max Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
abyssunder Posted November 15, 2017 Share Posted November 15, 2017 You could be right, but to be sure, try contacting the above authors, they'll know exactly how to assign them to the species. Nice finds, btw! " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Max-fossils Posted November 16, 2017 Author Share Posted November 16, 2017 21 hours ago, abyssunder said: You could be right, but to be sure, try contacting the above authors, they'll know exactly how to assign them to the species. Nice finds, btw! Thanks! As I said before, only #4 and #5 are personal finds. But in total I found a lot more (I just didn't display them because they were very similar to the ones I just posted), including some big ones in the Antwerp area. I'll try contacting Freddy van Nieulande, he will surely be able to help me. Thanks again for the help Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
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